A surprising move. One would imagine that White should castle queenside, especially after the opening of the h-file.
11... a8c8 Both sides had alternatives, but we cannot deny that all the moves were normal after the exotic 6.Nb3. 12. d1e2  12... f8e7  13. f2f4  13... h7h6 A new move. 13...Nc5 and 13...0-0 were tested in correspondence games.